11. Routing

Routing

Not Enough Addresses - Part 1

Not Enough Addresses - Part 2

Try It Yourself

Your Public IPv4 Address

The easiest way to find your public IP address is using the web. You can navigate to a website, such as whatismyip.com, or simply search, "What is my IP address" in a search engine such as Google to produce the result.

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QUESTION:

What is your public IPv4 address?

ANSWER:

Thanks for your response.

Your Private IPv4 Address

To find your private IP address, you can use a terminal. Depending on which OS (Operating System) you are running, the command to determine your IP address will differ. On a Linux or Mac, type in ifconfig, whereas on a Windows computer, type in ipconfig to find your IP address. The result may look like so,

Ethernet adapter Ethernet:

   Connection-specific DNS Suffix  . :
   Link-local IPv6 Address . . . . . : fe80::14a5:92a8:6620:114a%4
   IPv4 Address. . . . . . . . . . . : 192.168.50.197
   Subnet Mask . . . . . . . . . . . : 255.255.255.0
   Default Gateway . . . . . . . . . : 192.168.50.1

Often, running this command will return not one, but a number of network interfaces. Ethernet interfaces will be labelled eth0, eth1, etc., while Wi-Fi interfaces are often labelled wlan0, wlan1, on so on. A Mac may return an especially large number of network interfaces, as it uses a number of loopback interfaces (interfaces that the OS uses to communicate with itself).

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QUESTION:

What's your private IPv4 address?

ANSWER:

Thanks for your response.

Private IP addresses often reside on 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16, with the most common of all being, 192.168.0.0/24 (with a default gateway of 192.168.0.1).

IPv6

Note that not all Internet Service Providers (ISPs) support IPv6. To see if you have IPv6 enabled, visit the IPv6 test site.

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QUESTION:

Do you have IPv6 enabled?

ANSWER:

If you do - that's great, your ISP is on top of things! If you don't - not to worry, you're likely to have it soon.